"The Samuel Gompers Papers: The American Federation of Labor and the Great War, 1917-18". Book by Samuel Gompers, edited by Peter J. Albert and Grace Palladino, p. 348, 2006.
"Carl Reiner on writing a children's book, tweeting, and joking around with Mel Brooks". Interview with Katherine Brodsky, tv.avclub.com. June 23, 2015.